Portable drill



CII

,reiterated Aug. 31, 1926.

S 'E' 'l'i FREDERIC CRIBIER, GF 11i/'BEER KEN, NEE? JERSEY.

PORTABLE BRILL.

Application filed october 25', 1924.

This invention relates to portable drills and has for an object toprovide an iinproved construction wherein a con'ibustible mixture isused as a. power element in operating the drill;

Another object of- .'the invention is to provide a portable drillstructure wheren the pistonl acts as an exhaust valve.

A still further object oi" the invention is to provide a portable drillusing an explosive mixture as the power-element wherein a closed chamberis provided for the mixture at the time Voloperationv or explosion.

An additionalY object of the invention is to provide av portable drillvusinaj an explo-s.' y-e mixture as the power elementa the constructionbeing such that the momentum of the exhaust gases creates a suction fordrawing; yin new charge, the pants being adapted to remain open untilthe new charge has entered.

In thev accompanying drawing- The ligure is a longitudinal verticalsectional view through a drill, embodying; the invention.

Referring toY thev accompanyingdrawing by numerals, 1' indicates anordinary drill used' for drilling stone, concrete and the like. Insteadot usinga drill similar to the drill 1, a chisel. or other implementmigrht be used. Preferably, thedrill. 1 is provided with a ring 2 tolimit the upward movement into the bore 3 of the covering sleeve-1li.The sleeve 4- carries a guiding` boss 5 at the lower end while at theupper end it is mounted on the depending` sleeve 6, which sleeve theupper end mergesintoy a` closure disk 7 having` a number of apertures 8which act as exhaust ports. The disk 7 isbolted or otherwise rigidlysecured tothe lower end of the body 9, which body is tonmed with anexplosion chamber 10 occupying mostot the body. A shoulder or'stop 11.provides a seat in the body 9- which. co-actsk with the piston 12,which. pistony acts in. the additional capacity of an exhaust valve forchamber 10.` The piston` 12 is formed' with a kmetal body 1R. preferablyof steel., an asbestos disk. 1.4 and a metal washer 1,5'. The pistonmovable into the annular enlargement adjacent 'to the shoulder or stop,which enlargement constitutes an exhaust chamber. A depending rod1li/extends from the piston 12and is heut over :tor forming; a hook 1 7co-acting with the contact spring 18. This spring is supported On` thebody l' in any desired manner,

Serial No. M-,SOL

as for instance, by insulation 19, whereby it is .insulated from body 9and the battery 2O is grounded only when the hook 17 is engaging;- thespring 18. The piston 12 csrries a rod 2'1 acting;` as a hammer forstrik-i 'the upper end ot the drill 1. The hammer 21 is provided with areduced portion 22 surrounded. by the spring 23. which spri at one endbears against the shoulder :2li and the opposite end against the washerrlhe spring,r 23 continually acts to hold the piston 12in its closedposition as shown in the drawing, though it will permit the piston to bemoved downwardlyr to the dotted line shown in the drawing` whenever anexplosion takes place in chainberlO.

rlhe chamber may be of any desired shape andl at the upper end isprovided with handles 2G and 27, said handles act-ing` as the members bywhich the device may he maved from place to place.- The handles alsopermit the operator to guide-the tool when the device is in use.Arranged above andl bolted or otherwise rigidiv secured to the body 9,what may be termed a valve casing 2S which is provided with a valve seat29 normally engaged by the inlet valve 30. This valve cis provided witha valve rod 31 carryinga washer 32 and a pin at its upper end wherebythe spring 3d. may act on` the washer 32 and onthe plate 35 tor normallyholding the valve 3 seated, A stop sleeve 36 surrounds. the spring;v 34-andi extent-.s almost up to the washer 32 whereh valve can. open only7 avery short. distance. A suitable cap 37 enclosesthe upper end cf rod` 31and associated parts. An inlet pipe is connected tothe casing'- 28, saidinlet pipe permitting` an explosiveY mixture to pass into the casingfrom any suitable form of carburetor and from casing 28 the explosivemixture passes downwardly into the chamber 10 when valve BO is open. Aspark plug 39 of. any approved type is connected to a spark coil ll0which in turn. is connected to a sourceof current 2O and said source otcurrent is connected tothe contact or sprin-gr 18 whereby whenever thehook 17 is in the position shown in the drawing, the circuit will heclosed asA the spring; 19 will then be grounded.V rlhe spark plug` 39,is ot course, formed so that one side is @rounded and, therefore.whenever the hook 17V touches the spring;` 18, a spark will: beproduced.

In operation, the device may be moved readily from place to place andused in the usual manner ot portable drills. To cause the hammer 21 tooperate when the parts are all cold, a suction pump 41 of any desiredkind is applied to the valve 42, which valve is open. As the pump 41rareties the air in chamber 10, valve 30 will open and a combustiblemixture will be drawn into the chamber 10. As soon as this has occurred,the manually actuated switch 43 is closed and immediately the plug` 39will produce a spark :for igniting the explosive mixture. This willcause an explosion and will drive the piston 12 downwardly together withhammer @1 so that the hardened reduced end section 22 will strike thedrill or chisel 1 for producing the desired result. its the piston 12moves down to the dotted position shown in the drawing, the burnt willexhaust past the piston and out through the exhaust ports 8. rlhemomentum of discharge of the exhaust gases will produce a suction in theupper part ot the chamber 10, causing the valve 3.0 to open whereupon a.new charge ot explosive mixture is drawn in by the time the old chargehas been exhausted. As soon as the old charge has been exhausted and thepressure reduced, spring 25E will return the parts to the position shownin the drawing whereupon hool 17 will contact with spring 18 and plug 39will again spa-rk so that a new ignition or explosion of the combustiblemixture will take place. rlhis action continues as long as the switchil?) is closed. In order to assist until the parts become heated, pump41 may be operated until several explosions have taken place in chamber10, after which, valve 42' may be closed and t-he pump 41 dispensedwith. It will be noted that the chamber 10 is completely closed at thetime et explosion or sparking of the plug 39 whereby an appreciablepressure is generated and which will give the desired impulse to thepiston 12 and hammer 21. It will also be noted that the piston 12 actsin the double capacitv ot' an automatic exhaust valve and as a pistonwhile` the valve 30 acts as an automatic inlet valve. It will thus beseen that there are no driven parts necessary tor the operation of thedevice and the only moving parts are the two valves with theirassociated parts.

In forming the casing 28, the same is preferably curved out at 44 so asto provide in a certain sense an ignition chamber 4:5. The plug- 89extends into the chamber 4:5 and as this chamber is supplied with Ireshexplosive mixture upon each operation ot the device, the spark willproduce its desired function which would not be the case it the plun`was positioned near the exhaust port.

What claim is 1. A drill comprising a chamber havinf! exhaust ports andan adjacent stop constituting a seat, a valve controlling a combustiblecharge inlet to the chamber, a piston occupying said seat and carrying ahammer, and means including a spring pressing t h dl"0"tl the pistonagainst t e seat an closing nc chamber while a charge is ignited ing ablow to the piston and hammer said piston then being` unscated andacting as a valve to permitescape of the burnt gas to the ad'acent )ertsthe momentum of the l l i escaping gas producing suction to open theinlet valve tor the entrance ot another charge.

\ n n n y 2. A drill comprising a working` cnamber havinff annularexhaust chamber having ports and including a stop constituting a seat, avalve controlling` an inlet through which is admitted a combustiblecharge to lill the working chamber, a piston operable in said exhaustchamber, means including a spring to press the piston the scat and cutoil communication ot the working` chamber with said ports, and meansactuator by the piston upon said seating` thereof to ignite the cha ethereupon unseating the piston and dr lng it into the exhaust chamber toperi escape of the gas at said ports.

mit

i'i. drill comprising a chamber having an annular shoulder, a diskclosing` the adjacent end of the chamber but havingex.- haust ports, asleeve depending from the disk, a combustible charge inlet casing, avalve controlling the admission ot the charge -from the casing to thechamber, a hammer rod guided in said sleeve and carrying` piston, meansincluding a spring contained by said sleeve seatingl the piston uponsaid shoulder, and means actuated upon said seating of the piston toignite a charge in the chamber thereupon unseating the piston to permitescape of the gas at said ports and causing opening` of the inlet valvetor the admission of anotl er charge.

drill comprising a workingl chamber having an annular shoulder and anadjacent annular enlargement constituting an exhaust cliainher, meansincluding a closure disk completing the exhaust chamber but havingexhaust ports, sleeve dependingr from the disk, a covering sleeveapplied to the depending sleeve and providing` a rest, a shoulderedhammer rod Iguided in said sleeves and carrying` a piston, a spring rbearing against said rest and hammer rod shoulder to seat the pistonupon said annular shoulder, a valve operable to admit a combustiblecharge into the working chainber by suction created upon the escape otgas at said ports, and means actuated by the piston upon seating thereofto ignite said charge displacing the piston and iinparting` blow to adrill receivable the covering sleeve.

FREEEBC CRlBlEl-.

impart- H lil()

